LiquiMoly 3721 Engine Oil Additive

This is good stuff! My engine got a little bit more quiet, and noticeably smoother, and I got a little better gas mileage on highway trips about 2 1/4 miles per gallon more. Just so you know, it’s in a 2006 Mercedes-Benz C230 sport with 206,000 miles. I had changed the oil about 2500 miles ago with liquid Moly 0 W-40, and I just poured it in. No lie you can actually hear it circulate and quiet down the engine and it’s really cool to hear.

This stuff is really great as a friction reducer. In combination with a high quality synthetic oil, I feel like my engine noticeably runs smoother. I've started using it for all of my cars and with every oil change.

Has quieted down the engine on my vehicle with 180k miles on it. I am using this along with Valv’s Restore and Protect.

Recently tried the LiquiMoly 3721 Engine Oil Additive, and I’m thoroughly impressed with its performance. This additive is designed to enhance engine efficiency and longevity, and it certainly delivers on that promise.Just add it to your engine oil. After using it, I noticed a smoother engine performance and a reduction in friction and better gas mileage. The advanced ceramic technology in this additive helps protect engine components from wear and tear, which is a huge plus. Additionally, it has improved my fuel efficiency, making it a cost-effective solution in the long run.Overall, the LiquiMoly 3721 Engine Oil Additive is a fantastic product that lives up to its claims. I highly recommend it to anyone looking to improve their engine’s performance and extend its life.

Works like a charm. I use it every oil change and I’ve got 3 vehicles over 200k miles. I just add a whole bottle in with the new oil. Fuel economy increases are marginal, at best. Don’t expect increased fuel economy. This is to protect your engine and reduce wear. It does a great job at that.

Update 1:3K miles on Honda (41K mileage) - its better than the sound without ceratec in it. For a given car, less sound = less wearR171 - over 2000 miles, great mileage boost. Got back to the manufacturer suggested MPG rating of 24 MPG on highway, a boost from around 19MPG with ceratec and fuel injector cleaner together.Update after 500miles on Honda CRV:Not worried about the fuel efficiency, that's not the purpose of buying this. But fuel efficiency is an indicator of less friction and less wear. Definitely getting at least 1MPG higher, so at least that much frictional force is now avoided in the engine components. So, now I expect the Honda CRV 2017, known for oil dilution to last at least 100K miles. (40K now and 60K more to go).So, planning to use this with every oil change but add only 50ml for 4 gallon oil, to be safe.Pending Update on 3L naturally aspired R171._____Original Review:I got that notorious Honda CR-V 2017 1.5L Turbo, known for massive dilution with it GDI. Will update the review with results if that's affecting, if there is anyone interested to know (give me a 👍 so I know). I should know once I hit 2000miles, the Engine generally becomes ticky. Let me see how that helps.Fill oil to a min level, then added this, ran engine for few mins, topped up oil to get the level close to Max. For now, as soon as I added this with new oil, of course there is a reduction in noise and less ticking. But I don't know yet if that's due to new oil or Ceratec magic. Will update after I clock 2k miles.On my SLK300, 3L V6 naturally aspired engine, there is no noticeable change. I am expecting to see feedback via 0.5MPG increase, probably I should wait for 500miles at least, from what I read from the manufacturer.The bottles had some dings on them, probably not due to Amazon logistics because the paper cover was intact. No issues though.

My car drove like a dream~ I highly highly recommend this product.. I used less gas the engine purred..

Works FANTASTIC!!! No valve noise. Smooth idle. Better acceleration.